Two things: Check http://www.gnutellaforums.com/downlo...tml#post352264 but in the first suggestion, instead check it to be sure LW is made as the default to open torrent files. In the second suggestion, make sure you click the 'Always Open With' option for LW.

(That post was explaining how to change from LW, instead you want to know how to change to using LW as the torrent program.)